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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_WIN_SCOPED_HDC_H_
#define BASE_WIN_SCOPED_HDC_H_
#pragma once
#include <windows.h>
#include "base/basictypes.h"
#include "base/logging.h"
namespace base {
namespace win {
// Like ScopedHandle but for HDC. Only use this on HDCs returned from
// GetDC.
class ScopedGetDC {
public:
explicit ScopedGetDC(HWND hwnd)
: hwnd_(hwnd),
hdc_(GetDC(hwnd)) {
DCHECK(!hwnd_ || IsWindow(hwnd_));
DCHECK(hdc_);
}
~ScopedGetDC() {
if (hdc_)
ReleaseDC(hwnd_, hdc_);
}
operator HDC() { return hdc_; }
private:
HWND hwnd_;
HDC hdc_;
DISALLOW_COPY_AND_ASSIGN(ScopedGetDC);
};
// Like ScopedHandle but for HDC. Only use this on HDCs returned from
// CreateCompatibleDC, CreateDC and CreateIC.
class ScopedCreateDC {
public:
ScopedCreateDC() : hdc_(NULL) { }
explicit ScopedCreateDC(HDC h) : hdc_(h) { }
~ScopedCreateDC() {
Close();
}
HDC Get() {
return hdc_;
}
void Set(HDC h) {
Close();
hdc_ = h;
}
operator HDC() { return hdc_; }
private:
void Close() {
#ifdef NOGDI
assert(false);
#else
if (hdc_)
DeleteDC(hdc_);
#endif // NOGDI
}
HDC hdc_;
DISALLOW_COPY_AND_ASSIGN(ScopedCreateDC);
};
} // namespace win
} // namespace base
#endif // BASE_WIN_SCOPED_HDC_H_
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